My Civic does that on it's own and I find it to be very useful and that it doesn't seem to slow me down much at all! sure I can down shift and slow my self down when I'm coming to a stop, but most of the time it's just a matter of letting off the gas for a few seconds, if you do install a switch like this hook it up to a vacuum switch on the intake so it cuts fuel under high vacuum.
I'm kind of suprized that your car doesn't do this already on it's own.
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